Drilling Through Igneous Rock to Rescue the 33 Miners

On August 5, 2010, the San Jose Copper and Gold mine near Copiapó, Chile collapsed trapping 33 miners 2200 feet beneath the surface.  The San Jose mine has been operating for nearly 100 years, and the mining for copper and gold  is located in a granite type of rock diorite.  Diorite has about the same structural properties as granite but, perhaps because of its darker colour and more limited supply, is rarely used as an ornamental and building material.  … Read more

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